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525e1919f7
I think the control flow in this function is complicated and confusing, largely due to the use of two booleans `print_formatted` and `fallback_to_println` that are set in multiple places and then used to guide proceedings. As well as hurting readability, this leads to at least one bug: if the `write_termcolor_buf` call fails and the pager also fails, the function will try to print color output to stdout, but that output will be empty because `write_termcolor_buf` failed. I.e. the `if fallback_to_println` body fails to check `print_formatted`. This commit rewrites the function to be neater and more Rust-y, e.g. by putting the result of `write_termcolor_buf` into an `Option` so it can only be used on success, and by using `?` more. It also changes terminology a little, using "pretty" to mean "formatted and colorized". The result is a little shorter, more readable, and less buggy.